/*
 * Copyright 2012 Andrea Parodi
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package eban.storebyrules.results;

import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Author: parroit
 * Created: 07/05/12 10.52
 */
public class RowIterator implements Iterator<Result.Row> {
    private Result result;

    public RowIterator(Result rows) {
        this.result = rows;
        current = Rows.NO_CURRENT_ROW;
    }

    private Result.Row current;

    @Override public boolean hasNext() {
        result.next();

        current = result.current();
        if (result.atEnd())
            result.close();
        return !result.atEnd();
    }



    @Override public Result.Row next() {

        if (current == Rows.NO_CURRENT_ROW)
            throw new NoSuchElementException("result has no current row.");
        else
            return current;

    }

    @Override public void remove() {
        throw new UnsupportedOperationException("read only iterator");
    }
}
